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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
EMPLOYEE BENEFIT PLANS |  |  |
Employer's contribution (as a percent) | 20.00% |  |
Defined contributions schemes expense | $ 12,544 | $ 9,412 | $ 7,186
Percentage of applicable salaries contributed by the employer for medical insurance benefits | 10.00% |  |
Percentage of applicable salaries contributed by the employer for housing funds | 8.00% |  |
Percentage of applicable salaries contributed by the employer for unemployment benefits | 2.00% |  |
Percentage of applicable salaries contributed by the employer for other statutory benefits | 2.00% |  |
Amount of contribution by the employer for medical insurance benefits, housing funds, unemployment and other statutory benefits | $ 11,211 | $ 10,447 | $ 9,128

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- Definition Represents the amount of contributions made by an employer to the medical insurance benefits, housing funds, unemployment and other statutory benefits of a defined contribution plan. + References No definition available. + Details
Name: | csiq_DefinedContributionPlanEmployerContributionAmount
Namespace Prefix: | csiq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the percentage of employees' applicable salaries for which the employer contributes to the housing funds of a defined contribution plan. + References No definition available. + Details
Name: | csiq_DefinedContributionPlanEmployerContributionAsPercentageOfApplicableSalariesForHousingFunds
Namespace Prefix: | csiq_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of employees' applicable salaries for which the employer contributes to the medical insurance benefits of a defined contribution plan. + References No definition available. + Details
Name: | csiq_DefinedContributionPlanEmployerContributionAsPercentageOfApplicableSalariesForMedicalInsuranceBenefits
Namespace Prefix: | csiq_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of employees' applicable salaries for which the employer contributes to the other statutory benefits of a defined contribution plan. + References No definition available. + Details
Name: | csiq_DefinedContributionPlanEmployerContributionAsPercentageOfApplicableSalariesForOtherStatutoryBenefits
Namespace Prefix: | csiq_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of employees' applicable salaries for which the employer contributes to the unemployment benefits of a defined contribution plan. + References No definition available. + Details
Name: | csiq_DefinedContributionPlanEmployerContributionAsPercentageOfApplicableSalariesForUnemploymentBenefits
Namespace Prefix: | csiq_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration